Line data Source code
1 : /*
2 : * Copyright (C) 2007 Oracle. All rights reserved.
3 : *
4 : * This program is free software; you can redistribute it and/or
5 : * modify it under the terms of the GNU General Public
6 : * License v2 as published by the Free Software Foundation.
7 : *
8 : * This program is distributed in the hope that it will be useful,
9 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 : * General Public License for more details.
12 : *
13 : * You should have received a copy of the GNU General Public
14 : * License along with this program; if not, write to the
15 : * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 : * Boston, MA 021110-1307, USA.
17 : */
18 :
19 : #ifndef __BTRFS_TRANSACTION__
20 : #define __BTRFS_TRANSACTION__
21 : #include "btrfs_inode.h"
22 : #include "delayed-ref.h"
23 : #include "ctree.h"
24 :
25 : enum btrfs_trans_state {
26 : TRANS_STATE_RUNNING = 0,
27 : TRANS_STATE_BLOCKED = 1,
28 : TRANS_STATE_COMMIT_START = 2,
29 : TRANS_STATE_COMMIT_DOING = 3,
30 : TRANS_STATE_UNBLOCKED = 4,
31 : TRANS_STATE_COMPLETED = 5,
32 : TRANS_STATE_MAX = 6,
33 : };
34 :
35 : struct btrfs_transaction {
36 : u64 transid;
37 : /*
38 : * total external writers(USERSPACE/START/ATTACH) in this
39 : * transaction, it must be zero before the transaction is
40 : * being committed
41 : */
42 : atomic_t num_extwriters;
43 : /*
44 : * total writers in this transaction, it must be zero before the
45 : * transaction can end
46 : */
47 : atomic_t num_writers;
48 : atomic_t use_count;
49 :
50 : /* Be protected by fs_info->trans_lock when we want to change it. */
51 : enum btrfs_trans_state state;
52 : struct list_head list;
53 : struct extent_io_tree dirty_pages;
54 : unsigned long start_time;
55 : wait_queue_head_t writer_wait;
56 : wait_queue_head_t commit_wait;
57 : struct list_head pending_snapshots;
58 : struct list_head pending_chunks;
59 : struct list_head switch_commits;
60 : struct btrfs_delayed_ref_root delayed_refs;
61 : int aborted;
62 : };
63 :
64 : #define __TRANS_FREEZABLE (1U << 0)
65 :
66 : #define __TRANS_USERSPACE (1U << 8)
67 : #define __TRANS_START (1U << 9)
68 : #define __TRANS_ATTACH (1U << 10)
69 : #define __TRANS_JOIN (1U << 11)
70 : #define __TRANS_JOIN_NOLOCK (1U << 12)
71 : #define __TRANS_DUMMY (1U << 13)
72 :
73 : #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE)
74 : #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE)
75 : #define TRANS_ATTACH (__TRANS_ATTACH)
76 : #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE)
77 : #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK)
78 :
79 : #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \
80 : __TRANS_ATTACH)
81 :
82 : #define BTRFS_SEND_TRANS_STUB 1
83 :
84 : struct btrfs_trans_handle {
85 : u64 transid;
86 : u64 bytes_reserved;
87 : u64 qgroup_reserved;
88 : unsigned long use_count;
89 : unsigned long blocks_reserved;
90 : unsigned long blocks_used;
91 : unsigned long delayed_ref_updates;
92 : struct btrfs_transaction *transaction;
93 : struct btrfs_block_rsv *block_rsv;
94 : struct btrfs_block_rsv *orig_rsv;
95 : short aborted;
96 : short adding_csums;
97 : bool allocating_chunk;
98 : bool reloc_reserved;
99 : bool sync;
100 : unsigned int type;
101 : /*
102 : * this root is only needed to validate that the root passed to
103 : * start_transaction is the same as the one passed to end_transaction.
104 : * Subvolume quota depends on this
105 : */
106 : struct btrfs_root *root;
107 : struct seq_list delayed_ref_elem;
108 : struct list_head qgroup_ref_list;
109 : struct list_head new_bgs;
110 : };
111 :
112 : struct btrfs_pending_snapshot {
113 : struct dentry *dentry;
114 : struct inode *dir;
115 : struct btrfs_root *root;
116 : struct btrfs_root *snap;
117 : struct btrfs_qgroup_inherit *inherit;
118 : /* block reservation for the operation */
119 : struct btrfs_block_rsv block_rsv;
120 : u64 qgroup_reserved;
121 : /* extra metadata reseration for relocation */
122 : int error;
123 : bool readonly;
124 : struct list_head list;
125 : };
126 :
127 : static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
128 : struct inode *inode)
129 : {
130 192614 : BTRFS_I(inode)->last_trans = trans->transaction->transid;
131 192614 : BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
132 192614 : BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
133 : }
134 :
135 : int btrfs_end_transaction(struct btrfs_trans_handle *trans,
136 : struct btrfs_root *root);
137 : struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
138 : int num_items);
139 : struct btrfs_trans_handle *btrfs_start_transaction_lflush(
140 : struct btrfs_root *root, int num_items);
141 : struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
142 : struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
143 : struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
144 : struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
145 : struct btrfs_root *root);
146 : struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
147 : int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
148 : int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
149 : struct btrfs_root *root);
150 :
151 : void btrfs_add_dead_root(struct btrfs_root *root);
152 : int btrfs_defrag_root(struct btrfs_root *root);
153 : int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
154 : int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
155 : struct btrfs_root *root);
156 : int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
157 : struct btrfs_root *root,
158 : int wait_for_unblock);
159 : int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
160 : struct btrfs_root *root);
161 : int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
162 : struct btrfs_root *root);
163 : void btrfs_throttle(struct btrfs_root *root);
164 : int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
165 : struct btrfs_root *root);
166 : int btrfs_write_marked_extents(struct btrfs_root *root,
167 : struct extent_io_tree *dirty_pages, int mark);
168 : int btrfs_wait_marked_extents(struct btrfs_root *root,
169 : struct extent_io_tree *dirty_pages, int mark);
170 : int btrfs_transaction_blocked(struct btrfs_fs_info *info);
171 : int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
172 : void btrfs_put_transaction(struct btrfs_transaction *transaction);
173 : #endif
|
